公开(公告)号：WO2005104550A2

公开(公告)日：2005-11-03

申请号：PCT/US2005/012856

申请日：2005-04-15

Applicant: DOTCAST, INC. ,  CHUNG, Wonzoo ,  LONG, Christopher ,  ENDRES, Thomas

Inventor： CHUNG, Wonzoo ,  LONG, Christopher ,  ENDRES, Thomas

IPC: H04N7/08

CPC classification number: H04N7/08

Abstract: Methods and apparatus are described for inserting data in a communications system, such as in an existing analog communications system, using quadrature amplitude modulation (QAM) with in-phase analog signals and quadrature data signals. These methods can minimize the distortion to the analog signals while maximizing the data signal strength. The data signals may be sub-modulated on a subcarrier frequency such that the data signals do not interfere with the analog signal detectors in the analog signal receivers, and may be processed with an abatement filter to mitigate the distortion due to Nyquist mismatch in the receiver. The injection phase of data signals may be determined by adaptive algorithms, using a monitor analog signal receiver.

Abstract translation: 描述了使用具有同相模拟信号和正交数据信号的正交幅度调制（QAM）在诸如现有模拟通信系统的通信系统中插入数据的方法和装置。 这些方法可以最大限度地减少模拟信号的失真，同时最大化数据信号强度。 数据信号可以在子载波频率上进行子调制，使得数据信号不干扰模拟信号接收机中的模拟信号检测器，并且可以用减轻滤波器来处理由于接收机中奈奎斯特失配引起的失真 。 数据信号的注入阶段可以通过使用监视模拟信号接收机的自适应算法来确定。

公开(公告)号：WO2004075469A3

公开(公告)日：2004-10-07

申请号：PCT/US2004004887

申请日：2004-02-19

Applicant: DOTCAST INC ,  ENDRES THOMAS J ,  LONG CHRISTOPHER D ,  FAGAN RORY ,  CHUNG WONZOO

Inventor： ENDRES THOMAS J ,  LONG CHRISTOPHER D ,  FAGAN RORY ,  CHUNG WONZOO

IPC: H03G3/30 ,  H03L7/091 ,  H04L7/00 ,  H04L7/02 ,  H04L25/03 ,  H04L27/00 ,  H04L27/38

CPC classification number: H04L25/03057 ,  H03G3/3052 ,  H03G3/3089 ,  H03L7/091 ,  H03L2207/50 ,  H04L7/0029 ,  H04L7/0062 ,  H04L7/0079 ,  H04L7/0278 ,  H04L27/3809 ,  H04L2027/0032 ,  H04L2027/0036 ,  H04L2027/0038 ,  H04L2027/0053 ,  H04L2027/0055 ,  H04L2027/0065 ,  H04L2027/0067 ,  H04L2027/0069

Abstract: Various aspects and embodiments of the present invention derive statistics of received signal quality and use these statistics to jointly control operation of timing recovery, carrier recovery, automatic gain control, and equalization functions.

Abstract translation: 本发明的各个方面和实施例导出接收信号质量的统计，并使用这些统计来共同控制定时恢复，载波恢复，自动增益控制和均衡功能的操作。

公开(公告)号：WO2004057820A2

公开(公告)日：2004-07-08

申请号：PCT/US2003/040531

申请日：2003-12-17

Applicant: DOTCAST, INC. ,  ENDRES, Thomas, J. ,  LONG, Christopher, D. ,  CUNNINGHAM, Jeffery, K. ,  RAY, Gary, A.

Inventor： ENDRES, Thomas, J. ,  LONG, Christopher, D. ,  CUNNINGHAM, Jeffery, K. ,  RAY, Gary, A.

IPC: H04L25/03

CPC classification number: H03G3/3052 ,  H03G3/3089 ,  H04L25/03057 ,  H04L2025/03388 ,  H04L2025/0342 ,  H04L2025/0349 ,  H04L2025/03617 ,  H04L2025/0363 ,  H04L2027/003 ,  H04L2027/0055 ,  H04N7/08

Abstract: The present invention uses a feedback equalizer architecture with feedback samples comprised of weighted contributions of scaled soft and inversely-scaled hard decision samples, and adapts forward and feedback filters using weighted contributions of update error terms, such as Constant Modulus Algorithm (CMA) and Least Mean Squares (LMS) error terms. Combining weights are selected on a symbol-by-symbol basis by a novel measure of current sample quality. Adaptation methods of the sample quality measure are discussed. Furthermore, the present invention contains an automatic gain control circuit whose gain is adjusted at every symbol instance by a stochastic gradient descent update rule, minimizing novel cost criteria, to provide scaling factors for the hard and soft decisions.

Abstract translation: 本发明使用具有反馈样本的反馈均衡器架构，该反馈样本由缩放的软和反向尺度的硬判决样本的加权贡献组成，并且使用诸如恒模算法（CMA）和最小值的最小化的更新误差项的加权贡献来适配正向和反馈滤波器 均方误差（LMS）误差项。 通过对当前采样质量的新颖度量，逐个符号地选择组合权重。 讨论了样品质量测量的适应方法。 此外，本发明包含一种自动增益控制电路，其增益通过随机梯度下降更新规则在每个符号实例处进行调整，从而最小化新颖的成本标准，以提供硬和软决策的缩放因子。

公开(公告)号：WO0215428A3

公开(公告)日：2002-06-13

申请号：PCT/US0141734

申请日：2001-08-15

Applicant: DOTCAST INC ,  CICORA WALTER S ,  HARTSON TED

Inventor： CICORA WALTER S ,  HARTSON TED

IPC: H04B1/707 ,  H04N7/025 ,  H04N7/081 ,  H04N7/083 ,  H04N7/08

CPC classification number: H04N7/081 ,  H04B1/707 ,  H04B2201/70715 ,  H04N7/025 ,  H04N7/083

Abstract: Systems and processes for including spread spectrum transmissions within television and radio broadcast channels without substantial degradation of the broadcast programming. The spread spectrum transmissions may carry components of the same television or radio programming, they may be the same programming, or they may be content that is unrelated to the programming. Disclosed are systems and processes for accomplishing such spread spectrum transmissions in a manner that compensates for robustness of signal components, by among other things time varying and/or varying frequency of the spread spectrum transmissions. Also disclosed are systems and processes for abating carrier signals to compensate for the effects of the spread spectrum transmissions in the channel. Further disclosed are systems and processes for conducting such transmissions in a cellular communications system.

Abstract translation: 用于在电视和无线电广播频道内包括扩频传输的系统和过程，而广播节目没有明显的恶化。 扩频传输可以携带相同的电视或无线电节目的组件，它们可以是相同的节目，或者它们可以是与节目无关的内容。 公开了用于以补偿信号分量的鲁棒性的方式完成这种扩频传输的系统和过程，其中包括时变和/或频谱扩展频率的变化。 还公开了用于减轻载波信号以补偿信道中的扩频传输的影响的系统和过程。 进一步公开的是用于在蜂窝通信系统中进行这种传输的系统和过程。